from django.db import models
from django.utils.timezone import now
from account.models import User
from problem.models import Problem
from utils.models import RichTextField, JSONField


class ProblemSet(models.Model):
    """题单模型"""

    title = models.TextField(verbose_name="题单标题")
    description = RichTextField(verbose_name="题单描述")
    # 创建者
    created_by = models.ForeignKey(
        User, on_delete=models.CASCADE, verbose_name="创建者"
    )
    # 创建时间
    create_time = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
    # 更新时间
    last_update_time = models.DateTimeField(auto_now=True, verbose_name="更新时间")
    # 是否可见
    visible = models.BooleanField(default=True, verbose_name="是否可见")
    # 是否公开（所有用户都可以看到）
    is_public = models.BooleanField(default=True, verbose_name="是否公开")
    # 题单难度等级
    difficulty = models.TextField(default="Easy", verbose_name="难度等级")
    # 题单状态
    status = models.TextField(
        default="active", verbose_name="状态"
    )  # active, archived, draft

    class Meta:
        db_table = "problemset"
        ordering = ("-create_time",)
        verbose_name = "题单"
        verbose_name_plural = "题单"

    def __str__(self):
        return self.title


class ProblemSetProblem(models.Model):
    """题单题目关联模型"""

    problemset = models.ForeignKey(
        ProblemSet, on_delete=models.CASCADE, verbose_name="题单"
    )
    problem = models.ForeignKey(Problem, on_delete=models.CASCADE, verbose_name="题目")
    # 在题单中的顺序
    order = models.IntegerField(default=0, verbose_name="顺序")
    # 是否为必做题
    is_required = models.BooleanField(default=True, verbose_name="是否必做")
    # 题目在题单中的分值
    score = models.IntegerField(default=0, verbose_name="分值")
    # 题目提示信息
    hint = models.TextField(null=True, blank=True, verbose_name="提示")

    class Meta:
        db_table = "problemset_problem"
        unique_together = (("problemset", "problem"),)
        ordering = ("order",)
        verbose_name = "题单题目"
        verbose_name_plural = "题单题目"

    def __str__(self):
        return f"{self.problemset.title} - {self.problem.title}"


class ProblemSetBadge(models.Model):
    """题单奖章模型"""

    problemset = models.ForeignKey(
        ProblemSet, on_delete=models.CASCADE, verbose_name="题单"
    )
    name = models.TextField(verbose_name="奖章名称")
    description = models.TextField(verbose_name="奖章描述")
    # 奖章图标路径
    icon = models.TextField(verbose_name="奖章图标")
    # 获得条件：完成所有题目、完成指定数量题目、达到指定分数等
    condition_type = models.TextField(
        verbose_name="获得条件类型"
    )  # all_problems, problem_count, score
    condition_value = models.IntegerField(default=0, verbose_name="条件值")
    # 奖章等级
    level = models.IntegerField(default=1, verbose_name="奖章等级")

    class Meta:
        db_table = "problemset_badge"
        verbose_name = "题单奖章"
        verbose_name_plural = "题单奖章"

    def __str__(self):
        return f"{self.problemset.title} - {self.name}"


class ProblemSetProgress(models.Model):
    """题单进度模型"""

    problemset = models.ForeignKey(
        ProblemSet, on_delete=models.CASCADE, verbose_name="题单"
    )
    user = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name="用户")
    # 加入时间
    join_time = models.DateTimeField(auto_now_add=True, verbose_name="加入时间")
    # 完成时间
    complete_time = models.DateTimeField(null=True, blank=True, verbose_name="完成时间")
    # 是否完成
    is_completed = models.BooleanField(default=False, verbose_name="是否完成")
    # 完成进度百分比
    progress_percentage = models.FloatField(default=0.0, verbose_name="完成进度")
    # 已完成的题目数量
    completed_problems_count = models.IntegerField(
        default=0, verbose_name="已完成题目数"
    )
    # 总题目数量
    total_problems_count = models.IntegerField(default=0, verbose_name="总题目数")
    # 获得的总分
    total_score = models.IntegerField(default=0, verbose_name="总分")
    # 用户在该题单中的详细进度信息
    # {"problem_id": {"status": "completed", "score": 100, "submit_time": "2024-01-01T00:00:00Z"}}
    progress_detail = JSONField(default=dict, verbose_name="详细进度")

    class Meta:
        db_table = "problemset_progress"
        unique_together = (("problemset", "user"),)
        verbose_name = "题单进度"
        verbose_name_plural = "题单进度"

    def __str__(self):
        return f"{self.user.username} - {self.problemset.title}"

    def update_progress(self):
        """更新进度信息"""
        # 获取题单中的所有题目
        problemset_problems = ProblemSetProblem.objects.filter(
            problemset=self.problemset
        )
        self.total_problems_count = problemset_problems.count()

        # 计算已完成题目数
        completed_count = 0
        total_score = 0

        for psp in problemset_problems:
            problem_id = str(psp.problem.id)
            if problem_id in self.progress_detail:
                problem_progress = self.progress_detail[problem_id]
                if problem_progress.get("status") == "completed":
                    completed_count += 1
                    total_score += problem_progress.get("score", 0)

        self.completed_problems_count = completed_count
        self.total_score = total_score

        # 计算完成百分比
        if self.total_problems_count > 0:
            self.progress_percentage = (
                completed_count / self.total_problems_count
            ) * 100
        else:
            self.progress_percentage = 0

        # 检查是否完成
        self.is_completed = completed_count == self.total_problems_count
        if self.is_completed and not self.complete_time:
            self.complete_time = now()

        self.save()


class UserBadge(models.Model):
    """用户奖章模型"""

    user = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name="用户")
    badge = models.ForeignKey(
        ProblemSetBadge, on_delete=models.CASCADE, verbose_name="奖章"
    )
    # 获得时间
    earned_time = models.DateTimeField(auto_now_add=True, verbose_name="获得时间")
    # 是否已展示给用户
    is_displayed = models.BooleanField(default=False, verbose_name="是否已展示")

    class Meta:
        db_table = "user_badge"
        unique_together = (("user", "badge"),)
        verbose_name = "用户奖章"
        verbose_name_plural = "用户奖章"

    def __str__(self):
        return f"{self.user.username} - {self.badge.name}"